IB HL Maths

wee_ws SG

Hi,

Feel free to post any queries on HL maths :)

Btw, there are VERY MANY similarities between A-level H2 maths and IB HL maths. Students taking HL maths could look to H2 maths questions (say, from Dyna Publisher's H2 maths ten-year-series) for further practice. You may also visit my website for learning resources at

www.freewebs.com/weews

Thanks!

Cheers,
Wen Shih

skythewood SG

new competitor appears

wee_ws SG

Hi,

Instead of competing (which usually ends up in a win-lose or lose-lose outcome), it's better to collaborate to achieve a win-win situation for all concerned :)

Cheers,
Wen Shih

eagle SG

competitor?

eagle SG

Hi,

Instead of competing (which usually ends up in a win-lose or lose-lose outcome), it's better to collaborate to achieve a win-win situation for all concerned :)

Cheers,
Wen Shih

I will need to learn from you on how to use and teach graphic calculators :D

That's the main obstacle preventing me from teaching JC maths

wee_ws SG

Hi,

I will be very happy to share with you what I know :)

Cheers,
Wen Shih

wee_ws SG

Hi,

Here is a question from May '08 IB Maths HL paper 1, to kickstart a discussion:

A circular disc is cut into twelve sectors whose areas are in an arithmetic sequence.

The angle of the largest sector is twice the angle of the smallest sector.

Find the size of the angle of the smallest sector.

Thanks!

Cheers,
Wen Shih

Ahm97sic SG

Entry is deleted.

35sadboy SG

let a_1 denote angle of smallest sector and a_12 the largest angle, then using sum of arithmetic progression, we have following 2 equations

360 = [12(a_1 + a_12)]/2

a_12 = 2 a_1, so we just use all 3 equations to find that a_1 = 20 degrees.

wee_ws SG

Hi 35sadboy,

Correct :)

Maths HL tends to assess salient knowledge of maths. H2 maths go deeper at times.

Cheers,
Wen Shih

wee_ws SG

Hi,

A new question from May '07 IB Maths HL paper 1:

The function

f is defined as f (x) = sin x ln x for x \in [0.5, 3.5].

(a) Write down the

x-intercepts.

(b) The area above the

x-axis is A and the total area below the x-axis is B. If A = kB, find k.

Enjoy!

Cheers,
Wen Shih